Refrigeration



Patented -Aug. 4, 1936 REFRIGERATION Harry M. Williams, Dayton, Ohio, assigno r,

mcsne assignments, to General Motors Corpu ration, a corporation of Delaware No Drawingn, Application May 18, 1931, Serial N0. 538,398

V 6 This invention relates to refrigeration and more particularly to the sealing of refrigerating other halo-fluoro aliphatic derivatives of hydrocarbons as refrigerants in refrigeratingapparahis the sealing compound which has been used 10 on gaskets of compressors, insulation windings .of. motors or other places in the refrigerating system has been dissolved in the refrigerant, so

that the effectiveness of the seal has been seals are not destroyedby-the refrigerants being used in the refrigerating apparatus.- I have discovered that a mixture of vinyl ace- .tate and vinyl chloride'known commercially as- Vinylite 80 provides such a seal, and that this mixture, when properly treated, isinsoluble. in

'certain. halo-fluoro derivatives of the aliphatic v hydrocarbons and particularly CFzClz. Thusthis mixture overcomes difliculties heretofore expel'lenced with this problem.

For example, the metal gaskets and the threads otiittings which are used on compressors of refrigerating systems and receivers, condensers and evaporators are coated or. painted with a mixture of vinyl acetate and vinylchloride,

' allowed to air'-dry, and the parts assembled together in the usual manner.- -'I'hereafter the compressors are heated during the process of it enameling and drying for at least one hour at 200 F. in enameling ovens and a drying treatment of 10 hours at '225 F. in drying ovens; f

During suchtreatinent the composition flows and is chemieally so that it sets to a hard tough mass which is insoluble in the refrigerant; 40 Copper wire coils have been coated with'this mixture and 'given' asimilar baking and drying 'u-eaulient and it has 'beenfound that the coat-.

ing is insoluble in such iiliorine refrigerants. f The mixture of vinyl acetate and vinyl chloride be mixed with a solvent such as toluene.

destroyed. Objects of this invention include the" provision of effective seals for these places which the apparatus exposed to the refrigerant with chloride. a 1 6. Refrigerating apparatus containing an orby making a 35% solution of the mixture in toluene and such a solution forms an excellent lacquer-like material for'app'lication on the va-' rious parts of the refrigerating apparatus.

While the form of embodiment of the inven- 5 tion as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow. V

What is claimed is as follows: l 10 1. The method-ofsealing refrigerating apparar tus against thepassa'ge of organic refrigerants, .which comprises 'coating a part of the apparatus exposed to the refrigerant with a mixture of vinyl acetate and vinyl chloride, and drying said .r'nixture.

2. Themethod of sealing refrigerating appara- "tus against the passage of fluorine containingrefrigerants, which-comprises coating 9. part of 20 a mixture of vinyl acetate and vinyl chloride and treating the apparatus-by the application of heat suflicient' to render said mixture insoluble in the refrigerant. a

3. Refrigerating apparatus containing as a refrigerant a halogen derivative of an aliphatic hydrocarbon and having a separable joint in the refrigerant circuit of said apparatus treated with a mixtureof vinyl acetate and vinyl chloride. g so v 4. Refrigerating apparatus containing a balofluoro derivative of an aliphatic hydrocarbon and having a separable'joint in the'refrigerant-cir cult of said apparatus treated with a of vinyl acetate and vinyl chloride.

' 5. Refrigerating apparatus charged with a fluorine containing refrigerant having aseparable joint in the refrigerant circuit of said apparatus treated with a mixture of vinyl acetate and vinyl ganic refrigerant having a separable joint inthe refrigerant circuit of saidapparatus treated with acetate and vinyl chloride.

a'mi'xture of vinyl 

